Speed governors for liquid fuel injection pumps for internal combustion engines



Dec. 11, 1956 B. 'r. BLACK 2,773,684

SPEED GOVERNORSFORLIQUID FUEL. INJECTION PUMPS FOR INTERNAL COMBUSTION ENGINES Filed April 9, 1954 .llzzvelvtop fi-ffiLa cjr saw- United States Patent SPEED GOVERNORS FOR LIQUID FUEL INJEC- EII%%SPUMPS FOR INTERNAL COMBUSTION EN- Barrie Temple Black, Richmond, England, assignor to C. A. V. Limited, London, England Application April 9, 1954, Serial No. 422,225 Claims priority, application Great Britain April 15, 1953 1 Claim. (Cl. 264-3) This invention relates to speed governors for liquid fuel injection pumps for internal combustion engines, the pumps being of the kind having in combination therewith an output regulating means which includes a slidable control bar, the latter being operable between a pair of limiting stops by a lever connected to a centrifugal mechanism and also by a manually operable lever connected to the lever.

The object of the invention is to enable the connection between the centrifugal mechanism and the control bar actuating lever to be effected in a more convenient manner than heretofore.

The invention comprises the combination of a member arranged coaxially with the driving spindle of the governor and having a cylindrical bore, a cylindrical bush in axially slidable connection with the said member, a spring loaded stem axially slidable in the bush, a collar on one end of the stem and another collar on the adjacent end of the bush adapted to provide a connection with the lever which actuates the pump control bar, and a pair of abutments respectively provided on the other end of the said stem and the adjacent end of the bush for co-operating with a laterally movable transverse member connected to the centrifugal mechanism, the parts being adapted to co-operate as herein described.

The accompanying drawing illustrates diagrammatically one embodiment of the invention.

As already stated the invention is required for use on a pump the output regulating means of which includes a slidable bar which is movable between a pair of end stops. In the drawing the pump body is indicated by a, the slidable output control bar by b, and the stops by c, the bar being provided with an abutment d for co-operating with the stops. To the bar b is attached by a link e one end of a lever f, the other end of which is attached to the centrifugal mechanism through the means forming the subject of the present invention. The lever f has its fulcrum g on a lever h, the latter having its fulcrum i in a fixed position. The lever h is manually operable between positions determined by stops 1 and any convenient provision is made for securing this lever in any desired position. The bar b is movable by either the centrifugal mechanism or the manually operable lever h.

In the embodiment of the invention shown in the drawing there is provided at one end of a rotary spindle j, which may also be the driving spindle of the pump, a member k which carries a pair of bell-crank levers m each having combined with it a centrifugal mass n. These masses are loaded by springs o. In the member k is formed an axial bore p which receives one end of an axially slidable bush q connected by a key or spline r to the member k, and within the bush q is arranged a coaxial stem s which extends beyond one end of the bush. The stem is loaded by a spring 2 contained in the bush, one end of the spring or springs being in contact with a head 14 on the inner end of the stem (which head serves as one of the abutments to be hereinafter mentioned) and the other end of the spring being supported by a 70 1,972,482

shoulder v at the opposite end of the bus On the outer end of the stem is secured a collar w, an on the adjacent end of the bush is formed another colla x. One end of the lever f or a part connected theretc lies between the collars w, x.

At the end of the bush q adjacent to the aforesaid abut ment u on the inner end of the stem there is formed 01 or secured to the adjacent end of the bush a second abut ment y, and between these two abutments is arranged a transverse pin 2 which extends through slots in the busl q and the associated member k, the pin being movabll laterally by the bell-crank levers m which are operabll by the centrifugal weights n.

When the pump is at rest the control bar b is movec under the action of a spring into engagement with [ht right hand stop 0. In this position the pump gives it: maximum output when the pump is set in motion. Witt increasing speed the centrifugal mechanism moves the bar b to the left for reducing the pump output, minimum fuel being obtained when the bar is arrested by the left hand stop 0. Ad ustment of the governor is enected b the lever h, movement being ettected in the clockwise direction for increasing the engine speed and in the opposite direction for reduclng the speed.

The arrangement forming the subject of the invention is such that when abutment d on the pump regulating bar b is out of contact with either of the stops c, the lever 1 connected to the said bar can be actuated by either the centrifugal mechanism or the manually operable lever h, one end of the lever or a part associated therewith being then in contact with both of the collars w, x, and the pin z connected to the centrifugal mechanism being in contact with both of the associated abutments u, y. But when the said abutment a on the bar b is in contact with either of the stops 0 it is still possible to move the lever f by the manually operable lever h for altering the setting of the governor, this being permitted by relative axial movements of bush q and stem s against the action of the associated spring t.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

In a speed governor for a liquid fuel pump having a slidable control bar movable between two limit positions for regulating the pump output, the combination of a centrifugal mechanism, a spindle for driving said mechanism, a lever for imparting movement to the control bar under the action of said mechanism, a member arranged coaxially with and rotatable by said spindle, said member having an axial bore therein, a cylindrical bush slidable in said bore and rotatable with said member, a springloaded stem axially slidable in said bush, a pair of collars provided respectively on one end of said stem and the adjacent end of said bush, a part on said lever being situated between said collars so that joint axial movement of said stem and bush is accompanied by movement of said lever, a pair of abutments provided respectively on the other ends of said bush and stem, a laterally movable transverse member operable by said centrifugal mechanism and situated between said abutments so that lateral movements of said transverse member are accompanied by joint movements of said bush and stem, and a manually adjustable lever on which the first mentioned lever is mounted so that adjustment of said manually adjustable lever serves to vary the position of the fulcrum of the first mentioned lever irrespective of the axial position of the control bar, and without affecting the position of the centrifugal mechanism.

References Cited in the file of this patent UNITED STATES PATENTS 2,588,119 Hurst "a... Mar. 4, 1952 

